ROOM CF2
O. Mich. inv. 9505: Receipt (certificate) for work on the dykes
O. Mich. inv. 9514: Blank receipt (certificate) for work on the dykes
O. Mich. inv. 9594: Blank receipt (certificate) for work on the dykes

ROOM CE
O. Mich. inv. 9500: Receipt (certificate) for work on the dykes
O. Mich. inv. 9501: Receipt (certificate) for work on the dykes